A current control circuit for controlling a drive current supplied to an inductive load is provided. The current control circuit is configured to perform a first mode of controlling a duty of the drive current so as to be 100% until a current value of the drive current reaches a first target current value after a supply of the drive current is started, and a second mode of controlling the duty of the drive current to be a predetermined duty below 100% until the current value of the drive current reaches a second target current value that is greater than the first target current value after the current value of the drive current reaches the first target current value.

In one embodiment, electronic circuitry includes a reference circuit configured to generate a reference pulse signal synchronized with a clock signal on the basis of an input pulse signal, a delay circuit configured to delay the reference pulse signal and generate a delayed pulse signal, and an output circuit configured to output a pulse train including a plurality of pulses synchronized with the clock signal on the basis of the reference pulse signal and the delayed pulse signal, and the clock signal.

The invention relates to a method for controlling a converter connected to an electric machine by a cable (Cx) via a filter (F), said method consisting in determining at least one sequence of a plurality of voltage pulses forming a square wave signal to be applied to each conductor so as to minimize an overvoltage level, said sequence comprising a number 2N of successive pulses, N being greater than or equal to 1, each pulse being defined by a distinct rank n, said sequence being generated such that each increasing voltage pulse of rank n exhibits a pulse width that is identical to that of a decreasing voltage pulse of rank equal to 2N+1n, and the method includes the following steps in particular: determining the number of successive pulses of said sequence; determining the width of each pulse of the sequence made suitable for minimizing the overvoltage level across the terminals of the electric machine (M).

Disclosed herein is a method for controlling an electrical converter system that includes: determining a nominal pulse pattern (t.sub.p,i*, ?u.sub.p,i*) and a reference trajectory (x*) of at least one electrical quantity of the electrical converter system over a horizon of future sampling instants, the nominal pulse pattern (t.sub.p,i*, ?u.sub.p,i*) comprises switching transitions (?u.sub.p,i*) between output voltages of an electrical converter of the electrical converter system and the reference trajectory (x*) indicates a desired future development of an electrical quantity of the converter system; determining a small-signal pulse pattern (?.sub.abc(t, ?.sub.p,i)) by minimizing a cost function; determining a modified pulse pattern (t.sub.opt,p,i, ?u.sub.p,i) by moving the switching transitions of the nominal pulse pattern (t.sub.p,i*, ?u.sub.p,i*) to generate modified switching transitions; and applying at least the next switching transition of the modified pulse pattern (t.sub.opt,p,i, ?u.sub.p,i) to the electrical converter system.

A motor drive controller capable of taking measures against vibration or noise of a motor is provided. The motor drive controller configured to drive a stepping motor in microstepping mode controls the number of PWM (Pulse Width Modulation) cycles contained in one microstep cycle. More specifically, the number of PWM cycles contained in one microstep cycle is controlled so that a vibration contained in a current waveform determined by the number of PWM cycles contained in one microstep cycle does not approximate the natural frequency of the stepping motor.

A control device stores a plurality of operation patterns associated with each of synchronous numbers and modulation factors, and the synchronous numbers each define the upper limit of the number of switching operations for each switch constituting an inverter. The control device selects an appropriate operation pattern from among the stored operation patterns, and operates each switch on the basis of the selected operation pattern. The control device stores a plurality of operation patterns associated with the same modulation factor for the same synchronous number. In a case where there is a plurality of next patterns as operation patterns corresponding to a next modulation factor, the control device selects, from among the next patterns, an operation pattern with a small change from a currently set operation pattern.

In accordance with one aspect of the present disclosure, a motor drive control device is a motor drive control device performing PWM (Pulse Width Modulation) control of a motor, wherein harmonics of a fundamental frequency for PWM control of the motor are included in noise occurring from the motor; the fundamental frequency for PWM control is larger than a frequency corresponding to a bandwidth of a predetermined radio frequency band a communication apparatus uses; and frequencies of continuous harmonic components of the fundamental frequency for PWM control appear before and after the predetermined radio frequency band.

Control over the operation of an electrically-controlled motor is supported by an interface circuit between the electrically-controlled motor and a near-field radio frequency communication controller. The interface circuit includes a first circuit that receives at least one control set point through a near-field radio frequency communication issued by the near-field radio frequency communication controller. A second circuit of the interface generates one or more electric signals in pulse width modulation based on the control set point.

This application relates to the field of drive control technologies, and discloses a drive control apparatus for a brushless motor and a related device, to quickly turn off a brushless motor. A specific solution is as follows: A motor drive circuit is connected to a brushless motor, and a discharge circuit is connected to the brushless motor and the motor drive circuit. The motor drive circuit is configured to: in a turn-off period of the brushless motor, stop supplying power to the brushless motor, and output an induced current generated by the brushless motor to the discharge circuit. The discharge circuit is configured to: in the turn-off period of the brushless motor, receive the induced current, and apply work by using the induced current, to consume electric energy of the brushless motor, and accelerate turn-off of the brushless motor.

The invention relates to a method for controlling a converter connected to an electric machine by a cable (Cx) via a filter (F), said method consisting in determining at least one sequence of a plurality of voltage pulses forming a square wave signal to be applied to each conductor so as to minimize an overvoltage level, said sequence comprising a number 2N of successive pulses, N being greater than or equal to 1, each pulse being defined by a distinct rank n, said sequence being generated such that each increasing voltage pulse of rank n exhibits a pulse width that is identical to that of a decreasing voltage pulse of rank equal to 2N+1n, and the method includes the following steps in particular: determining the number of successive pulses of said sequence; determining the width of each pulse of the sequence made suitable for minimizing the overvoltage level across the terminals of the electric machine (M).